Valve.



D. DBNNEHY.

VALVE.

APPLICATION FILED MAY 24, 1913.

COLUMBIA PLANOGIIAP" 60.. WASHINGTON. n. c.

Patented Nov. 18, 1913.

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lTE @Trtllflb ATENT @l l ltt/E.

DENIS DENNEHY, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO MICHAEL H. DENNEHY, 0F PITTSBURGH, PENNSYLVANIA.

VALVE.

To all whom it may concern Be it known that I, Dams Deanna), of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Im n-ovtnnents in Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The primary object of this invention is to provide a check valve which will be operative regardless of the direction of How, it being possible to prevent back pressure when the flow is reversed without changing the position of the valve-casing.

In the accompanying drawings, Figure 1 is a horizontal sectional view showing the parts in the position they occupy when the normal flow is from left to right. Fig. 2 is a similar View showing the parts in position for a flow from right to left. Fig. 3 shows the two plugs on quarter turns rela tively t0 the positions shown in Fig. 1.

Referring to the drawings, 1 designates a casing having a straightavay passage therein, and capable of being secured to sections of a pipe line. \Vithin this casing is a central valve-chamber 2 which is prefcraljily provided with longitudinally extending ribs 3 for guiding a ball valve t which is free to move longitudinally within the valvechamber.

5, 5, designate two plugs whose seats pass transversely through casing 1 on opposite sides of valvechamber 2. Each plug has a port or passageway 6 extending transversely therethrough, each port terminating at one side of the plug in a comparatively narrow or elongated opening 7 (see Fig. 3) and at the other side in a rounded or spheroidal opening 8 which conforms to the contour of ball-valve 4. The narrow or elongated opening 7 of each plug always faces the line of flow and hence the rounded or spheroidal opening 8 of only one of the plugs at a time will face valvechamber 2. In consequence, the inflow will keep ball valve t from seating against the inwardly-facing opening 8, and the fluid after passing around the ball valve will find its exit through the port in the other plug. For the purpose of preventing the ball valve from sealing the in- Speeification of Letters Patent.

Application filed May 24, 1913.

Patented Nov. 1 8, 1913. Serial No. 769,591.

\vardly facing elongated opening 7 of the latter plug .1. preferably provide a cross member 9 at about the center of such opening. If there is any back pressure, when the parts are in the position shown in Fig. l, the valve will immediately scat over the opening 8 thereby checking back pressure.

Let it be assumed that the parts are in the position shown in Fig. 1 when the device is mounted in a feed line, and it then be discovered that the line of How is from right to left instead of from left to right. It is only necessary in such contingency, for the operator to give each plug a half turn when, as shown in Fig. 2, the opening 8 of the plug to the right will coincide with the valve chamber, and the elongated opening 7 of the plug to the left will face such chamber. Hence, under such conditions the ball valve will normally be kept from its seat by the tlow, but will be imn'iediately seated by any back pressure. Thus it will be seen that it is innmitcrial how the valve casing is located in the feed line, that is to say, there is no danger of its being rendered inoperative by reason of the reversal of its ends, since the plugs may be readily turned into either of the positions desired. In some instances, where the same feed line is desired for conveying fluids alternately in opposite directions it is only necessary to reverse the plugs.

l have shown each plug as having a central stud 10 projecting therefrom whereby any suitable implement may be employed for turning it, and I have likewise shown them equipped at their opposite ends with threaded projections for atrctmnnodating binding nuts l2 between which and the casing are suitable washers. It will be understood, of course, that the seats for the plugs may be made of any suitable material and after any desired form, and that suitable marks on the plugs and easing will indicate the positions of the plugs. Each plug is provided with a small lateral port 13 for coinciding with side openings it to drain the valve casing.

From what has been said it will be seen that a valve constructed as herein described has many advantages. Not only may it be used in a pipe line having the flow alternately in opposite directions and capable under all conditions of checking back pres- 

